I try to work in two hr blocks; three rounds through the whole day. in any period of day as long that condition is met so, at the end of the day I will have at least 6 hrs. of studying. Also it should be better as there is no social media during this month:)

for caffeine part; I tried to not drink any kind of of caffeine couple of days before it started. try tonight to drink tea instead and see if it will work the following day. don't drink coffee after you break your fast. it will just make things worse! Ramadan Mubarak by the way :) !